Whether it's the holidays or the middle of summer, Canada is sending more people to Orlando through OIA than any other country.

The Robinsons said central Florida has what they want -- theme parks and stores.

"I think there's so much to do. You won't get bored, going to all the parks. The weather, the weather is great most of the time. It's easy," said Amy Robinson. "(I got) souvenirs, sweatshirts, that sort of thing."

International travel is delivering powerful growth. Of the more than 35 million total passengers last year, OIA saw a slight drop in domestic passengers, but a big jump of more than 10 percent by international passengers.

"The economic impact of international travel is pretty substantial," said Jerry Harris, spokesman for Orlando International Airport.

Harris said foreign travelers are money in the bank.

"The international service coming in and out of Orlando accounts for about $2 billion annually," said Harris.

Overall, Brazil sends more travelers to Florida than any other country.

"It's like a dream come true to come here and to take a look, and the roller coasters, and my brother loves Universal Studios and Islands of Adventure," said Brazilian tourist Diana Mesquite.

If domestic air travel begins to grow substantially again and foreign travel continues to climb, OIA may have to look at expanding its terminal space.

Orlando International Airport

Images: Millions expected to move through Orlando airport

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Wednesday marks one of the busiest travel days of the year -- both in the air and on the roads.